there is some truth to the notion that 'improving' a chamber can lead to problems in some instances with the use of standard, factory loads in such a rifle. it's a problem if the neck/shoulder junction on the 'improved' chamber is a little too far forward in a chamber to allow a standard variation of the cartridge to bump its shoulder up against the neck/shoulder junction of the chamber. a handloaded, standard round (such as a .308) can be developed with a 'false shoulder' that can help with use in an 'improved' chamber, but it is time-consuming to do such handloading.Varminter said:I started reading the specs on a 223 AI and i think i want to do this to my 223 barrel. I'm not sure if the handi will handle it or what all is really involved. Can anyone help me out.